Unadjusted | Adjusted 1 | Adjusted 2 | |
Beta (95% CI) | Beta (95% CI) | Beta (95% CI) | |
(1) Frequency of hard stools at age 4 weeks | |||
Never | 0.00 ref | 0.00 ref | 0.00 ref |
Sometimes/occasionally | −0.215 (−0.268 to −0.162) | −0.051 (−0.109 to 0.008) | 0.038 (−0.033 to 0.109) |
Always | −0.479 (−0.677 to −0.281) | −0.229 (−0.445 to −0.013) | −0.111 (−0.331 to 0.109) |
Omnibus p value | P<0.001 | P=0.034 | P=0.293 |
R2 | 0.012 | 0.0445 | 0.0488 |
N | 6796 | 5249 | 5126 |
(2) Frequency of hard stools at age 6 months | |||
Never | 0.00 ref | 0.00 ref | 0.00 ref |
Sometimes | −0.114 (−0.158 to −0.070) | −0.089 (−0.135 to −0.043) | −0.077 (−0.124 to −0.029) |
Usually | −0.171 (−0.237 to −0.104) | −0.103 (−0.172 to −0.034) | −0.092 (−0.163 to −0.021) |
Omnibus p value | P<0.001 | P<0.001 | P=0.003 |
R2 | 0.0036 | 0.0511 | 0.0558 |
N | 9828 | 7550 | 7214 |
Estimates represent standardised differences in continuous measure of fibre intake relative to the group who are reported to never suffer from hard stools.
Adjusted 1: adjusted for sex, and sociodemographic variables (mother’s social class, based on the occupational social class classification dichotomised into non-manual (professional, managerial and skilled occupations) and manual (comprising partly skilled or unskilled professions); early parenthood indicating if the mother was under 19 years when giving birth to the study child; level of maternal education: <O-level (ie, no school leaving qualification), O-level (school leaving qualifications obtained at age 16 years) and A-level/degree (qualifications from further education); housing tenure: mortgaged/owned; privately rented; subsidised rented; and experience of material hardship (dichotomous variable); household income equivalised, a composite measure of disposable income split into quintiles.).
Adjusted 2: (1) further adjusted for breast/bottle feeding status in first 4 weeks/(2) further adjusted for breastfeeding duration in first 6 months and timing of introduction of both milk and solids.